Tunnel construction.



No. 760,243. PATENTED MAY 17, 1904. D. PHILLIPS. I

TUNNEL CONSTRUCTION;

APPLIOATION rum) snr'r. 19, 1903.

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By W ATTURNE PATENTED MAY 17, 1904.

D. PHILLIPS, TUNNEL CONSTRUCTION.

APPLIGATIOK FILED SEPT. 19, 1903.

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WWMWWWWWN WWHWM W WW UNITED STATES Patented May 17, 1904.

DAVID PHILLIPS, OF PONY, MONTANA.

TUNNEL CONSTRUCTION.

SPECIFICATION forming part of Letters Patent N0. 760,243, dated May 17,1904:.

Application filed September 19, 1903. Serial No. 173,856. (No model.)

To aZZ whom it may concern:

Be it known that I, DAVID PHILLIPS, a citizen of the United States, anda resident of Pony, in the county of Madison and State of Montana, haveinvented a new and Improved Tunnel Construction, of which the followingis a full, clear, and exact description.

This invention relates to improvements in the art of constructingtunnels under water, an object being to provide a means whereby aiublmerged tunnel may be rapidly and safely ui t.

I will describe a tunnel construction embodying my invention and thenpoint out the novel features in the appended claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the figures.

Figure 1 is a side elevation of a tunnel construction embodying myinvention. Fig. 2 is a transverse section thereof, and Fig. 3 is asection on the line m w of Fig. 2.

' In constructing a tunnel I employ a false tunnel or casing 1 ofinflatable material such, for instance, as can vas-properly treated torender it water and air tight. The bottom wall of the false tunnel issecured, by means of bolts 2, to I-beams or ties 3, the said bolts 2passing through stay-plates i on the inner side of the false tunnel,asclearly shown in Fig. 2. The ends of the ties 3 extend outward from thesides of the false tunnel, and on these extended ends are track-rails 5,on which cars 6, loaded with pig-iron or other suitable weights, are tobe run in order to sink the false tunnel.

The permanent tunnel, built within the false tunnel, consists ofrectangular metal plates 7, having inwardly-extending flanges, throughwhich fastening-rivets 8 extend. This tunnel rests uponlongitudinally-arranged beams 9, and it may be trued up by means ofwedges 10 between said beams and the bottom of the tunnel. The permanenttunnel at its shore ends will preferably rest on solid foundations, andat desired intervals supports may be formed by rocks and gravel, andwhere these supports are arranged the ties 3 are lifted and rest uponsaid supports. After finishing the tunnel, however, the ties between thesaid supported ties, with the false tunnel, are to be removed.

In operation the false tunnel, which is divided into compartments bybulkheads 11, each provided with a valve 12, while in a collapsed state,with the ties attached, is to be discharged from a vesseluntil extendedentirely across the bed for the tunnel, and then a compartment is to beinflated and a section of permanent tunnel built therein, after whichthe next section, by opening ,the valve 12, is to be inflated, theweighted cars run thereon, and another section of permanent tunnel builtand joined to the preceding one, as indicated in the patent granted tome under date of August 25, 1903, No. 377 ,466.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a tunnel construction, an inflatable falsetunnel or casing, cross-ties secured to the bottom of said casing andextended outward from the sides thereof, car-tracks arranged on saidextended ends," and a fixed tunnel within the false tunnel.

2. In a tunnel construction, an inflatable false tunnel or casing,cross-ties to which the bottom of said false tunnel or casing issecured, tracks arranged on the outwardly-extended ends of saidcross-ties, and weighted cars for running on said tracks.

3. In a tunnel construction, an inflatable casing, cross-ties to whichsaid casing is attached, weighting devices movable on said cross-ties, apermanent tunnel arranged within the false tunnel, and means forleveling said permanent tunnel.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

DAVID PHILLIPS. Witnesses: I

W. B. LAMBDIN, W. H. BECKWITI-I.

